package com.swak.frame.excel;


import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import com.alibaba.excel.write.style.row.AbstractRowHeightStyleStrategy;
import com.swak.frame.excel.metadata.WriteExcelParams;
import com.swak.frame.excel.styler.ExcelExportStyler;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

/**
 * AutoColumnWidthStyleStrategy.java
 * @author colley.ma
 * @date 2022/9/20 13:29
 */
public class AutoColumnWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {

	private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();
	@Override
	 protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell,
		        Head head, Integer relativeRowIndex, Boolean isHead) {
		boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
		if (needSetWidth) {
			Map<Integer, Integer> maxColumnWidthMap = CACHE.get(writeSheetHolder.getSheetNo());
			if (maxColumnWidthMap == null) {
				maxColumnWidthMap = new HashMap<Integer, Integer>();
				CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);
			}
			Integer columnWidth = this.dataLength(cellDataList, cell, isHead);
			if (columnWidth >= 0) {
				if (columnWidth > 255) {
					columnWidth = 255;
				}
				Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
				if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
					maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
					writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
				}
			}
		} 
	 }
	
	private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
		if (isHead) {
			// 此处加5可以额外扩充列宽度
			return cell.getStringCellValue().getBytes().length + 5;
		} else {
			WriteCellData<?> cellData = cellDataList.get(0);
			CellDataTypeEnum type = cellData.getType();
			if (type == null) {
				return -1;
			} else {
				switch (type) {
				case STRING:
					return cellData.getStringValue().getBytes().length;
				case BOOLEAN:
					return cellData.getBooleanValue().toString().getBytes().length;
				case NUMBER:
					return cellData.getNumberValue().toString().getBytes().length;
				default:
					return -1;
				}
			}
		}
	}
	
	public  static HorizontalCellStyleStrategy createStyleStrategy(WriteExcelParams writeParams) {
		ExcelExportStyler excelExportStyler = writeParams.getExcelExportStyler();
		// 这个策略是头是头的样式内容是内容的样式其他的策略可以⾃⼰实现
		HorizontalCellStyleStrategy horizontalCellStyleStrategy = 
				new HorizontalCellStyleStrategy(excelExportStyler.getHeaderStyle(writeParams),
				excelExportStyler.getContentStyles(writeParams));
		return horizontalCellStyleStrategy;
	}

	/**
	 * 设置行高
	 */
	public  static class CustomRowHeightStyleStrategy extends AbstractRowHeightStyleStrategy {
		private  WriteExcelParams writeParams;

		public CustomRowHeightStyleStrategy(WriteExcelParams writeParams) {
			this.writeParams = writeParams;
		}

		@Override
		protected void setHeadColumnHeight(Row row, int index) {
			if(Objects.nonNull(writeParams.getHeadHeight())){
				row.setHeightInPoints(writeParams.getHeadHeight().floatValue());
			}
		}

		@Override
		protected void setContentColumnHeight(Row row, int i) {
			if(Objects.nonNull(writeParams.getContentHeight())){
				row.setHeightInPoints(writeParams.getContentHeight().floatValue());
			}
		}
	}
}
